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Divestitures and Other Transactions Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Loss from discontinued operations after income taxes | $ 0 | $ (5)
Divested Ag Business [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Loss from Discontinued Operation, before Income Tax |  | (10)
Loss from discontinued operations after income taxes |  | $ (5)

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